package com.jml.容器;

import org.junit.Test;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Vector;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @Author: J
 * @DATE: 2022-04-18 9:58
 */
public class ArrayListTest {
    @Test
    public void test() {
        ConcurrentHashMap concurrentHashMap = new ConcurrentHashMap();
        new HashMap<String, Integer>(100);
        ArrayList a = new ArrayList();
        new Vector(1, 1);
        new Hashtable<>();
    }
}
